APA (7th ed.) Citation

Gerking, S. D. (1974). Biological systems (2d ed.). Saunders.

Chicago Style (17th ed.) Citation

Gerking, Shelby Delos. Biological Systems. 2d ed. Philadelphia: Saunders, 1974.

MLA (8th ed.) Citation

Gerking, Shelby Delos. Biological Systems. 2d ed. Saunders, 1974.

Warning: These citations may not always be 100% accurate.